1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* Process declarations and symbol lookup for C++ front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
32 #include "coretypes.h"
47 #include "tree-mudflap.h"
49 #include "tree-inline.h"
51 #include "tree-dump.h"
54 extern cpp_reader *parse_in;
56 /* This structure contains information about the initializations
57 and/or destructions required for a particular priority level. */
58 typedef struct priority_info_s {
59 /* Nonzero if there have been any initializations at this priority
60 throughout the translation unit. */
61 int initializations_p;
62 /* Nonzero if there have been any destructions at this priority
63 throughout the translation unit. */
67 static void mark_vtable_entries (tree);
68 static bool maybe_emit_vtables (tree);
69 static bool acceptable_java_type (tree);
70 static tree start_objects (int, int);
71 static void finish_objects (int, int, tree);
72 static tree start_static_storage_duration_function (unsigned);
73 static void finish_static_storage_duration_function (tree);
74 static priority_info get_priority_info (int);
75 static void do_static_initialization_or_destruction (tree, bool);
76 static void one_static_initialization_or_destruction (tree, tree, bool);
77 static void generate_ctor_or_dtor_function (bool, int, location_t *);
78 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
80 static tree prune_vars_needing_no_initialization (tree *);
81 static void write_out_vars (tree);
82 static void import_export_class (tree);
83 static tree get_guard_bits (tree);
84 static void determine_visibility_from_class (tree, tree);
86 /* A list of static class variables. This is needed, because a
87 static class variable can be declared inside the class without
88 an initializer, and then initialized, statically, outside the class. */
89 static GTY(()) VEC(tree,gc) *pending_statics;
91 /* A list of functions which were declared inline, but which we
92 may need to emit outline anyway. */
93 static GTY(()) VEC(tree,gc) *deferred_fns;
95 /* Nonzero if we're done parsing and into end-of-file activities. */
101 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
102 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
103 that apply to the function). */
106 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
111 if (fntype == error_mark_node || ctype == error_mark_node)
112 return error_mark_node;
114 type_quals = quals & ~TYPE_QUAL_RESTRICT;
115 ctype = cp_build_qualified_type (ctype, type_quals);
116 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
117 (TREE_CODE (fntype) == METHOD_TYPE
118 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
119 : TYPE_ARG_TYPES (fntype)));
120 raises = TYPE_RAISES_EXCEPTIONS (fntype);
122 fntype = build_exception_variant (fntype, raises);
127 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
131 cp_build_parm_decl (tree name, tree type)
133 tree parm = build_decl (PARM_DECL, name, type);
134 /* DECL_ARG_TYPE is only used by the back end and the back end never
136 if (!processing_template_decl)
137 DECL_ARG_TYPE (parm) = type_passed_as (type);
139 /* If the type is a pack expansion, then we have a function
141 if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION)
142 FUNCTION_PARAMETER_PACK_P (parm) = 1;
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name, tree type)
153 tree parm = cp_build_parm_decl (name, type);
154 DECL_ARTIFICIAL (parm) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn)
177 tree basetype, arg_types, parms, parm, fntype;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
194 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
195 basetype = TREE_TYPE (TREE_VALUE (arg_types));
196 arg_types = TREE_CHAIN (arg_types);
198 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm) = parms;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
213 DECL_HAS_VTT_PARM_P (fn) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
218 TREE_CHAIN (parm) = parms;
220 arg_types = hash_tree_chain (integer_type_node, arg_types);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
225 /* And rebuild the function type. */
226 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
229 fntype = build_exception_variant (fntype,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
231 TREE_TYPE (fn) = fntype;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype, tree function, enum overload_flags flags)
260 tree fn_name = DECL_NAME (function);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function, lang_cplusplus);
266 if (fn_name == NULL_TREE)
268 error ("name missing for member function");
269 fn_name = get_identifier ("<anonymous>");
270 DECL_NAME (function) = fn_name;
273 DECL_CONTEXT (function) = ctype;
275 if (flags == DTOR_FLAG)
276 DECL_DESTRUCTOR_P (function) = 1;
278 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
279 maybe_retrofit_in_chrg (function);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr, tree index_exp)
290 tree orig_array_expr = array_expr;
291 tree orig_index_exp = index_exp;
293 if (error_operand_p (array_expr) || error_operand_p (index_exp))
294 return error_mark_node;
296 if (processing_template_decl)
298 if (type_dependent_expression_p (array_expr)
299 || type_dependent_expression_p (index_exp))
300 return build_min_nt (ARRAY_REF, array_expr, index_exp,
301 NULL_TREE, NULL_TREE);
302 array_expr = build_non_dependent_expr (array_expr);
303 index_exp = build_non_dependent_expr (index_exp);
306 type = TREE_TYPE (array_expr);
308 type = non_reference (type);
310 /* If they have an `operator[]', use that. */
311 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type) == ARRAY_TYPE)
326 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
328 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
331 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
333 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
335 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
338 if ((p1 && i2) && (i1 && p2))
339 error ("ambiguous conversion for array subscript");
342 array_expr = p1, index_exp = i2;
344 array_expr = p2, index_exp = i1;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type, TREE_TYPE (index_exp));
349 return error_mark_node;
352 if (array_expr == error_mark_node || index_exp == error_mark_node)
353 error ("ambiguous conversion for array subscript");
355 expr = build_array_ref (array_expr, index_exp);
357 if (processing_template_decl && expr != error_mark_node)
358 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
359 NULL_TREE, NULL_TREE);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
375 if (exp == error_mark_node)
378 if (processing_template_decl)
380 t = build_min (DELETE_EXPR, void_type_node, exp, size);
381 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
382 DELETE_EXPR_USE_VEC (t) = doing_vec;
383 TREE_SIDE_EFFECTS (t) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
390 warning (0, "deleting array %q#D", exp);
392 t = build_expr_type_conversion (WANT_POINTER, exp, true);
394 if (t == NULL_TREE || t == error_mark_node)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node;
401 type = TREE_TYPE (t);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
416 warning (0, "deleting %qT is undefined", type);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t))
422 return build1 (NOP_EXPR, void_type_node, t);
425 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
426 sfk_deleting_destructor,
429 return build_delete (type, t, sfk_deleting_destructor,
430 LOOKUP_NORMAL, use_global_delete);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl)
441 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
442 decl = DECL_TEMPLATE_RESULT (tmpl);
444 if (TREE_CODE (decl) == FUNCTION_DECL
445 || (TREE_CODE (decl) == TYPE_DECL
446 && IS_AGGR_TYPE (TREE_TYPE (decl))))
448 /* The parser rejects template declarations in local classes. */
449 gcc_assert (!current_function_decl);
450 /* The parser rejects any use of virtual in a function template. */
451 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
452 && DECL_VIRTUAL_P (decl)));
454 /* The debug-information generating code doesn't know what to do
455 with member templates. */
456 DECL_IGNORED_P (tmpl) = 1;
459 error ("template declaration of %q#D", decl);
462 /* Return true iff TYPE is a valid Java parameter or return type. */
465 acceptable_java_type (tree type)
467 if (type == error_mark_node)
470 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
472 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
474 type = TREE_TYPE (type);
475 if (TREE_CODE (type) == RECORD_TYPE)
478 if (! TYPE_FOR_JAVA (type))
480 if (! CLASSTYPE_TEMPLATE_INFO (type))
482 args = CLASSTYPE_TI_ARGS (type);
483 i = TREE_VEC_LENGTH (args);
486 type = TREE_VEC_ELT (args, i);
487 if (TREE_CODE (type) == POINTER_TYPE)
488 type = TREE_TYPE (type);
489 if (! TYPE_FOR_JAVA (type))
498 /* For a METHOD in a Java class CTYPE, return true if
499 the parameter and return types are valid Java types.
500 Otherwise, print appropriate error messages, and return false. */
503 check_java_method (tree method)
506 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
507 tree ret_type = TREE_TYPE (TREE_TYPE (method));
509 if (!acceptable_java_type (ret_type))
511 error ("Java method %qD has non-Java return type %qT",
516 arg_types = TREE_CHAIN (arg_types);
517 if (DECL_HAS_IN_CHARGE_PARM_P (method))
518 arg_types = TREE_CHAIN (arg_types);
519 if (DECL_HAS_VTT_PARM_P (method))
520 arg_types = TREE_CHAIN (arg_types);
522 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
524 tree type = TREE_VALUE (arg_types);
525 if (!acceptable_java_type (type))
527 if (type != error_mark_node)
528 error ("Java method %qD has non-Java parameter type %qT",
536 /* Sanity check: report error if this function FUNCTION is not
537 really a member of the class (CTYPE) it is supposed to belong to.
538 TEMPLATE_PARMS is used to specify the template parameters of a member
539 template passed as FUNCTION_DECL. If the member template is passed as a
540 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
541 from the declaration. If the function is not a function template, it
543 It returns the original declaration for the function, NULL_TREE if
544 no declaration was found, error_mark_node if an error was emitted. */
547 check_classfn (tree ctype, tree function, tree template_parms)
553 if (DECL_USE_TEMPLATE (function)
554 && !(TREE_CODE (function) == TEMPLATE_DECL
555 && DECL_TEMPLATE_SPECIALIZATION (function))
556 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
557 /* Since this is a specialization of a member template,
558 we're not going to find the declaration in the class.
561 struct S { template <typename T> void f(T); };
562 template <> void S::f(int);
564 we're not going to find `S::f(int)', but there's no
565 reason we should, either. We let our callers know we didn't
566 find the method, but we don't complain. */
569 /* Basic sanity check: for a template function, the template parameters
570 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
571 if (TREE_CODE (function) == TEMPLATE_DECL)
573 gcc_assert (!template_parms
574 || comp_template_parms (template_parms,
575 DECL_TEMPLATE_PARMS (function)));
576 template_parms = DECL_TEMPLATE_PARMS (function);
579 /* OK, is this a definition of a member template? */
580 is_template = (template_parms != NULL_TREE);
582 /* We must enter the scope here, because conversion operators are
583 named by target type, and type equivalence relies on typenames
584 resolving within the scope of CTYPE. */
585 pushed_scope = push_scope (ctype);
586 ix = class_method_index_for_fn (complete_type (ctype), function);
589 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
590 tree fndecls, fndecl = 0;
592 const char *format = NULL;
594 for (fndecls = VEC_index (tree, methods, ix);
595 fndecls; fndecls = OVL_NEXT (fndecls))
599 fndecl = OVL_CURRENT (fndecls);
600 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
601 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
603 /* We cannot simply call decls_match because this doesn't
604 work for static member functions that are pretending to
605 be methods, and because the name may have been changed by
608 /* Get rid of the this parameter on functions that become
610 if (DECL_STATIC_FUNCTION_P (fndecl)
611 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
612 p1 = TREE_CHAIN (p1);
614 /* A member template definition only matches a member template
616 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
619 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
620 TREE_TYPE (TREE_TYPE (fndecl)))
621 && compparms (p1, p2)
623 || comp_template_parms (template_parms,
624 DECL_TEMPLATE_PARMS (fndecl)))
625 && (DECL_TEMPLATE_SPECIALIZATION (function)
626 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
627 && (!DECL_TEMPLATE_SPECIALIZATION (function)
628 || (DECL_TI_TEMPLATE (function)
629 == DECL_TI_TEMPLATE (fndecl))))
635 pop_scope (pushed_scope);
636 return OVL_CURRENT (fndecls);
639 error ("prototype for %q#D does not match any in class %qT",
641 is_conv_op = DECL_CONV_FN_P (fndecl);
644 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
645 fndecls = VEC_index (tree, methods, ix);
648 fndecl = OVL_CURRENT (fndecls);
649 fndecls = OVL_NEXT (fndecls);
651 if (!fndecls && is_conv_op)
653 if (VEC_length (tree, methods) > (size_t) ++ix)
655 fndecls = VEC_index (tree, methods, ix);
656 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
668 format = N_("candidates are: %+#D");
670 format = N_("candidate is: %+#D");
671 error (format, fndecl);
674 else if (!COMPLETE_TYPE_P (ctype))
675 cxx_incomplete_type_error (function, ctype);
677 error ("no %q#D member function declared in class %qT",
681 pop_scope (pushed_scope);
682 return error_mark_node;
685 /* DECL is a function with vague linkage. Remember it so that at the
686 end of the translation unit we can decide whether or not to emit
690 note_vague_linkage_fn (tree decl)
692 if (!DECL_DEFERRED_FN (decl))
694 DECL_DEFERRED_FN (decl) = 1;
695 DECL_DEFER_OUTPUT (decl) = 1;
696 VEC_safe_push (tree, gc, deferred_fns, decl);
700 /* We have just processed the DECL, which is a static data member.
701 The other parameters are as for cp_finish_decl. */
704 finish_static_data_member_decl (tree decl,
705 tree init, bool init_const_expr_p,
709 DECL_CONTEXT (decl) = current_class_type;
711 /* We cannot call pushdecl here, because that would fill in the
712 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
713 the right thing, namely, to put this decl out straight away. */
715 if (! processing_template_decl)
716 VEC_safe_push (tree, gc, pending_statics, decl);
718 if (LOCAL_CLASS_P (current_class_type))
719 pedwarn ("local class %q#T shall not have static data member %q#D",
720 current_class_type, decl);
722 /* Static consts need not be initialized in the class definition. */
723 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
725 static int explained = 0;
727 error ("initializer invalid for static member with constructor");
730 error ("(an out of class initialization is required)");
735 /* Force the compiler to know when an uninitialized static const
736 member is being used. */
737 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
738 TREE_USED (decl) = 1;
739 DECL_INITIAL (decl) = init;
740 DECL_IN_AGGR_P (decl) = 1;
742 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
745 /* DECLARATOR and DECLSPECS correspond to a class member. The other
746 parameters are as for cp_finish_decl. Return the DECL for the
747 class member declared. */
750 grokfield (const cp_declarator *declarator,
751 cp_decl_specifier_seq *declspecs,
752 tree init, bool init_const_expr_p,
757 const char *asmspec = 0;
758 int flags = LOOKUP_ONLYCONVERTING;
761 && TREE_CODE (init) == TREE_LIST
762 && TREE_VALUE (init) == error_mark_node
763 && TREE_CHAIN (init) == NULL_TREE)
766 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
767 if (! value || error_operand_p (value))
768 /* friend or constructor went bad. */
769 return error_mark_node;
771 if (TREE_CODE (value) == TYPE_DECL && init)
773 error ("typedef %qD is initialized (use __typeof__ instead)", value);
777 /* Pass friendly classes back. */
778 if (value == void_type_node)
781 /* Pass friend decls back. */
782 if ((TREE_CODE (value) == FUNCTION_DECL
783 || TREE_CODE (value) == TEMPLATE_DECL)
784 && DECL_CONTEXT (value) != current_class_type)
787 if (DECL_NAME (value) != NULL_TREE
788 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
789 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
790 error ("member %qD conflicts with virtual function table field name",
793 /* Stash away type declarations. */
794 if (TREE_CODE (value) == TYPE_DECL)
796 DECL_NONLOCAL (value) = 1;
797 DECL_CONTEXT (value) = current_class_type;
799 if (processing_template_decl)
800 value = push_template_decl (value);
803 cplus_decl_attributes (&value, attrlist, 0);
808 if (DECL_IN_AGGR_P (value))
810 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
811 return void_type_node;
814 if (asmspec_tree && asmspec_tree != error_mark_node)
815 asmspec = TREE_STRING_POINTER (asmspec_tree);
819 if (TREE_CODE (value) == FUNCTION_DECL)
821 /* Initializers for functions are rejected early in the parser.
822 If we get here, it must be a pure specifier for a method. */
823 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
825 gcc_assert (error_operand_p (init) || integer_zerop (init));
826 DECL_PURE_VIRTUAL_P (value) = 1;
830 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
831 error ("initializer specified for static member function %qD",
835 else if (pedantic && TREE_CODE (value) != VAR_DECL)
836 /* Already complained in grokdeclarator. */
838 else if (!processing_template_decl)
840 if (TREE_CODE (init) == CONSTRUCTOR)
841 init = digest_init (TREE_TYPE (value), init);
843 init = integral_constant_value (init);
845 if (init != error_mark_node && !TREE_CONSTANT (init))
847 /* We can allow references to things that are effectively
848 static, since references are initialized with the
850 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
851 || (TREE_STATIC (init) == 0
852 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
854 error ("field initializer is not constant");
855 init = error_mark_node;
861 if (processing_template_decl
862 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
864 value = push_template_decl (value);
865 if (error_operand_p (value))
866 return error_mark_node;
870 cplus_decl_attributes (&value, attrlist, 0);
872 switch (TREE_CODE (value))
875 finish_static_data_member_decl (value, init, init_const_expr_p,
876 asmspec_tree, flags);
881 error ("%<asm%> specifiers are not permitted on non-static data members");
882 if (DECL_INITIAL (value) == error_mark_node)
883 init = error_mark_node;
884 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
886 DECL_INITIAL (value) = init;
887 DECL_IN_AGGR_P (value) = 1;
892 set_user_assembler_name (value, asmspec);
894 cp_finish_decl (value,
896 /*init_const_expr_p=*/false,
897 asmspec_tree, flags);
899 /* Pass friends back this way. */
900 if (DECL_FRIEND_P (value))
901 return void_type_node;
903 DECL_IN_AGGR_P (value) = 1;
912 /* Like `grokfield', but for bitfields.
913 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
916 grokbitfield (const cp_declarator *declarator,
917 cp_decl_specifier_seq *declspecs, tree width)
919 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
921 if (value == error_mark_node)
922 return NULL_TREE; /* friends went bad. */
924 /* Pass friendly classes back. */
925 if (TREE_CODE (value) == VOID_TYPE)
926 return void_type_node;
928 if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
929 && (POINTER_TYPE_P (value)
930 || !dependent_type_p (TREE_TYPE (value))))
932 error ("bit-field %qD with non-integral type", value);
933 return error_mark_node;
936 if (TREE_CODE (value) == TYPE_DECL)
938 error ("cannot declare %qD to be a bit-field type", value);
942 /* Usually, finish_struct_1 catches bitfields with invalid types.
943 But, in the case of bitfields with function type, we confuse
944 ourselves into thinking they are member functions, so we must
946 if (TREE_CODE (value) == FUNCTION_DECL)
948 error ("cannot declare bit-field %qD with function type",
953 if (DECL_IN_AGGR_P (value))
955 error ("%qD is already defined in the class %qT", value,
956 DECL_CONTEXT (value));
957 return void_type_node;
960 if (TREE_STATIC (value))
962 error ("static member %qD cannot be a bit-field", value);
965 finish_decl (value, NULL_TREE, NULL_TREE);
967 if (width != error_mark_node)
969 constant_expression_warning (width);
970 DECL_INITIAL (value) = width;
971 SET_DECL_C_BIT_FIELD (value);
974 DECL_IN_AGGR_P (value) = 1;
979 /* Returns true iff ATTR is an attribute which needs to be applied at
980 instantiation time rather than template definition time. */
983 is_late_template_attribute (tree attr, tree decl)
985 tree name = TREE_PURPOSE (attr);
986 tree args = TREE_VALUE (attr);
987 const struct attribute_spec *spec = lookup_attribute_spec (name);
990 /* Unknown attribute. */
993 if (is_attribute_p ("aligned", name)
995 && value_dependent_expression_p (TREE_VALUE (args)))
996 /* Can't apply this until we know the desired alignment. */
998 else if (TREE_CODE (decl) == TYPE_DECL || spec->type_required)
1000 tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
1002 /* We can't apply any attributes to a completely unknown type until
1003 instantiation time. */
1004 enum tree_code code = TREE_CODE (type);
1005 if (code == TEMPLATE_TYPE_PARM
1006 || code == BOUND_TEMPLATE_TEMPLATE_PARM
1007 || code == TYPENAME_TYPE)
1016 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1017 applied at instantiation time and return them. If IS_DEPENDENT is true,
1018 the declaration itself is dependent, so all attributes should be applied
1019 at instantiation time. */
1022 splice_template_attributes (tree *attr_p, tree decl)
1025 tree late_attrs = NULL_TREE;
1026 tree *q = &late_attrs;
1033 if (is_late_template_attribute (*p, decl))
1035 ATTR_IS_DEPENDENT (*p) = 1;
1037 *p = TREE_CHAIN (*p);
1038 q = &TREE_CHAIN (*q);
1042 p = &TREE_CHAIN (*p);
1048 /* Remove any late attributes from the list in ATTR_P and attach them to
1052 save_template_attributes (tree *attr_p, tree *decl_p)
1054 tree late_attrs = splice_template_attributes (attr_p, *decl_p);
1060 /* Give this type a name so we know to look it up again at instantiation
1062 if (TREE_CODE (*decl_p) == TYPE_DECL
1063 && DECL_ORIGINAL_TYPE (*decl_p) == NULL_TREE)
1065 tree oldt = TREE_TYPE (*decl_p);
1066 tree newt = build_variant_type_copy (oldt);
1067 DECL_ORIGINAL_TYPE (*decl_p) = oldt;
1068 TREE_TYPE (*decl_p) = newt;
1069 TYPE_NAME (newt) = *decl_p;
1070 TREE_USED (newt) = TREE_USED (*decl_p);
1073 if (DECL_P (*decl_p))
1074 q = &DECL_ATTRIBUTES (*decl_p);
1076 q = &TYPE_ATTRIBUTES (*decl_p);
1079 q = &TREE_CHAIN (tree_last (*q));
1083 /* Like decl_attributes, but handle C++ complexity. */
1086 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1088 if (*decl == NULL_TREE || *decl == void_type_node
1089 || *decl == error_mark_node
1090 || attributes == NULL_TREE)
1093 if (processing_template_decl)
1095 save_template_attributes (&attributes, decl);
1096 if (attributes == NULL_TREE)
1100 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1101 decl = &DECL_TEMPLATE_RESULT (*decl);
1103 decl_attributes (decl, attributes, flags);
1105 if (TREE_CODE (*decl) == TYPE_DECL)
1106 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1109 /* Walks through the namespace- or function-scope anonymous union
1110 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1111 Returns one of the fields for use in the mangled name. */
1114 build_anon_union_vars (tree type, tree object)
1116 tree main_decl = NULL_TREE;
1119 /* Rather than write the code to handle the non-union case,
1120 just give an error. */
1121 if (TREE_CODE (type) != UNION_TYPE)
1122 error ("anonymous struct not inside named type");
1124 for (field = TYPE_FIELDS (type);
1126 field = TREE_CHAIN (field))
1131 if (DECL_ARTIFICIAL (field))
1133 if (TREE_CODE (field) != FIELD_DECL)
1135 pedwarn ("%q+#D invalid; an anonymous union can only "
1136 "have non-static data members", field);
1140 if (TREE_PRIVATE (field))
1141 pedwarn ("private member %q+#D in anonymous union", field);
1142 else if (TREE_PROTECTED (field))
1143 pedwarn ("protected member %q+#D in anonymous union", field);
1145 if (processing_template_decl)
1146 ref = build_min_nt (COMPONENT_REF, object,
1147 DECL_NAME (field), NULL_TREE);
1149 ref = build_class_member_access_expr (object, field, NULL_TREE,
1152 if (DECL_NAME (field))
1156 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1157 DECL_ANON_UNION_VAR_P (decl) = 1;
1159 base = get_base_address (object);
1160 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1161 TREE_STATIC (decl) = TREE_STATIC (base);
1162 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1164 SET_DECL_VALUE_EXPR (decl, ref);
1165 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1167 decl = pushdecl (decl);
1169 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1170 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1174 if (main_decl == NULL_TREE)
1181 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1182 anonymous union, then all members must be laid out together. PUBLIC_P
1183 is nonzero if this union is not declared static. */
1186 finish_anon_union (tree anon_union_decl)
1192 if (anon_union_decl == error_mark_node)
1195 type = TREE_TYPE (anon_union_decl);
1196 public_p = TREE_PUBLIC (anon_union_decl);
1198 /* The VAR_DECL's context is the same as the TYPE's context. */
1199 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1201 if (TYPE_FIELDS (type) == NULL_TREE)
1206 error ("namespace-scope anonymous aggregates must be static");
1210 main_decl = build_anon_union_vars (type, anon_union_decl);
1211 if (main_decl == error_mark_node)
1213 if (main_decl == NULL_TREE)
1215 warning (0, "anonymous union with no members");
1219 if (!processing_template_decl)
1221 /* Use main_decl to set the mangled name. */
1222 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1223 mangle_decl (anon_union_decl);
1224 DECL_NAME (anon_union_decl) = NULL_TREE;
1227 pushdecl (anon_union_decl);
1228 if (building_stmt_tree ()
1229 && at_function_scope_p ())
1230 add_decl_expr (anon_union_decl);
1231 else if (!processing_template_decl)
1232 rest_of_decl_compilation (anon_union_decl,
1233 toplevel_bindings_p (), at_eof);
1236 /* Auxiliary functions to make type signatures for
1237 `operator new' and `operator delete' correspond to
1238 what compiler will be expecting. */
1241 coerce_new_type (tree type)
1244 tree args = TYPE_ARG_TYPES (type);
1246 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1248 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1251 error ("%<operator new%> must return type %qT", ptr_type_node);
1254 if (args && args != void_list_node)
1256 if (TREE_PURPOSE (args))
1258 /* [basic.stc.dynamic.allocation]
1260 The first parameter shall not have an associated default
1262 error ("the first parameter of %<operator new%> cannot "
1263 "have a default argument");
1264 /* Throw away the default argument. */
1265 TREE_PURPOSE (args) = NULL_TREE;
1268 if (!same_type_p (TREE_VALUE (args), size_type_node))
1271 args = TREE_CHAIN (args);
1278 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1279 "as first parameter", size_type_node);
1284 args = tree_cons (NULL_TREE, size_type_node, args);
1287 type = build_exception_variant
1288 (build_function_type (ptr_type_node, args),
1289 TYPE_RAISES_EXCEPTIONS (type));
1297 coerce_delete_type (tree type)
1300 tree args = TYPE_ARG_TYPES (type);
1302 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1304 if (!same_type_p (TREE_TYPE (type), void_type_node))
1307 error ("%<operator delete%> must return type %qT", void_type_node);
1310 if (!args || args == void_list_node
1311 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1314 if (args && args != void_list_node)
1315 args = TREE_CHAIN (args);
1316 error ("%<operator delete%> takes type %qT as first parameter",
1322 args = tree_cons (NULL_TREE, ptr_type_node, args);
1325 type = build_exception_variant
1326 (build_function_type (void_type_node, args),
1327 TYPE_RAISES_EXCEPTIONS (type));
1335 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1336 and mark them as needed. */
1339 mark_vtable_entries (tree decl)
1342 unsigned HOST_WIDE_INT idx;
1344 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1349 STRIP_NOPS (fnaddr);
1351 if (TREE_CODE (fnaddr) != ADDR_EXPR
1352 && TREE_CODE (fnaddr) != FDESC_EXPR)
1353 /* This entry is an offset: a virtual base class offset, a
1354 virtual call offset, an RTTI offset, etc. */
1357 fn = TREE_OPERAND (fnaddr, 0);
1358 TREE_ADDRESSABLE (fn) = 1;
1359 /* When we don't have vcall offsets, we output thunks whenever
1360 we output the vtables that contain them. With vcall offsets,
1361 we know all the thunks we'll need when we emit a virtual
1362 function, so we emit the thunks there instead. */
1363 if (DECL_THUNK_P (fn))
1364 use_thunk (fn, /*emit_p=*/0);
1369 /* Set DECL up to have the closest approximation of "initialized common"
1370 linkage available. */
1373 comdat_linkage (tree decl)
1376 make_decl_one_only (decl);
1377 else if (TREE_CODE (decl) == FUNCTION_DECL
1378 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1379 /* We can just emit function and compiler-generated variables
1380 statically; having multiple copies is (for the most part) only
1383 There are two correctness issues, however: the address of a
1384 template instantiation with external linkage should be the
1385 same, independent of what translation unit asks for the
1386 address, and this will not hold when we emit multiple copies of
1387 the function. However, there's little else we can do.
1389 Also, by default, the typeinfo implementation assumes that
1390 there will be only one copy of the string used as the name for
1391 each type. Therefore, if weak symbols are unavailable, the
1392 run-time library should perform a more conservative check; it
1393 should perform a string comparison, rather than an address
1395 TREE_PUBLIC (decl) = 0;
1398 /* Static data member template instantiations, however, cannot
1399 have multiple copies. */
1400 if (DECL_INITIAL (decl) == 0
1401 || DECL_INITIAL (decl) == error_mark_node)
1402 DECL_COMMON (decl) = 1;
1403 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1405 DECL_COMMON (decl) = 1;
1406 DECL_INITIAL (decl) = error_mark_node;
1408 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1410 /* We can't do anything useful; leave vars for explicit
1412 DECL_EXTERNAL (decl) = 1;
1413 DECL_NOT_REALLY_EXTERN (decl) = 0;
1417 if (DECL_LANG_SPECIFIC (decl))
1418 DECL_COMDAT (decl) = 1;
1421 /* For win32 we also want to put explicit instantiations in
1422 linkonce sections, so that they will be merged with implicit
1423 instantiations; otherwise we get duplicate symbol errors.
1424 For Darwin we do not want explicit instantiations to be
1428 maybe_make_one_only (tree decl)
1430 /* We used to say that this was not necessary on targets that support weak
1431 symbols, because the implicit instantiations will defer to the explicit
1432 one. However, that's not actually the case in SVR4; a strong definition
1433 after a weak one is an error. Also, not making explicit
1434 instantiations one_only means that we can end up with two copies of
1435 some template instantiations. */
1439 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1440 we can get away with not emitting them if they aren't used. We need
1441 to for variables so that cp_finish_decl will update their linkage,
1442 because their DECL_INITIAL may not have been set properly yet. */
1444 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1445 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1446 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1448 make_decl_one_only (decl);
1450 if (TREE_CODE (decl) == VAR_DECL)
1452 DECL_COMDAT (decl) = 1;
1453 /* Mark it needed so we don't forget to emit it. */
1454 mark_decl_referenced (decl);
1459 /* Determine whether or not we want to specifically import or export CTYPE,
1460 using various heuristics. */
1463 import_export_class (tree ctype)
1465 /* -1 for imported, 1 for exported. */
1466 int import_export = 0;
1468 /* It only makes sense to call this function at EOF. The reason is
1469 that this function looks at whether or not the first non-inline
1470 non-abstract virtual member function has been defined in this
1471 translation unit. But, we can't possibly know that until we've
1472 seen the entire translation unit. */
1473 gcc_assert (at_eof);
1475 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1478 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1479 we will have CLASSTYPE_INTERFACE_ONLY set but not
1480 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1481 heuristic because someone will supply a #pragma implementation
1482 elsewhere, and deducing it here would produce a conflict. */
1483 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1486 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1488 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1490 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1491 && !flag_implicit_templates)
1492 /* For a template class, without -fimplicit-templates, check the
1493 repository. If the virtual table is assigned to this
1494 translation unit, then export the class; otherwise, import
1496 import_export = repo_export_class_p (ctype) ? 1 : -1;
1497 else if (TYPE_POLYMORPHIC_P (ctype))
1499 /* The ABI specifies that the virtual table and associated
1500 information are emitted with the key method, if any. */
1501 tree method = CLASSTYPE_KEY_METHOD (ctype);
1502 /* If weak symbol support is not available, then we must be
1503 careful not to emit the vtable when the key function is
1504 inline. An inline function can be defined in multiple
1505 translation units. If we were to emit the vtable in each
1506 translation unit containing a definition, we would get
1507 multiple definition errors at link-time. */
1508 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1509 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1512 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1513 a definition anywhere else. */
1514 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1517 /* Allow back ends the chance to overrule the decision. */
1518 if (targetm.cxx.import_export_class)
1519 import_export = targetm.cxx.import_export_class (ctype, import_export);
1523 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1524 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1528 /* Return true if VAR has already been provided to the back end; in that
1529 case VAR should not be modified further by the front end. */
1531 var_finalized_p (tree var)
1533 return varpool_node (var)->finalized;
1536 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1537 must be emitted in this translation unit. Mark it as such. */
1540 mark_needed (tree decl)
1542 /* It's possible that we no longer need to set
1543 TREE_SYMBOL_REFERENCED here directly, but doing so is
1545 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1546 mark_decl_referenced (decl);
1549 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1550 returns true if a definition of this entity should be provided in
1551 this object file. Callers use this function to determine whether
1552 or not to let the back end know that a definition of DECL is
1553 available in this translation unit. */
1556 decl_needed_p (tree decl)
1558 gcc_assert (TREE_CODE (decl) == VAR_DECL
1559 || TREE_CODE (decl) == FUNCTION_DECL);
1560 /* This function should only be called at the end of the translation
1561 unit. We cannot be sure of whether or not something will be
1562 COMDAT until that point. */
1563 gcc_assert (at_eof);
1565 /* All entities with external linkage that are not COMDAT should be
1566 emitted; they may be referred to from other object files. */
1567 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1569 /* If this entity was used, let the back end see it; it will decide
1570 whether or not to emit it into the object file. */
1571 if (TREE_USED (decl)
1572 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1573 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1575 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1576 reference to DECL might cause it to be emitted later. */
1580 /* If necessary, write out the vtables for the dynamic class CTYPE.
1581 Returns true if any vtables were emitted. */
1584 maybe_emit_vtables (tree ctype)
1590 /* If the vtables for this class have already been emitted there is
1591 nothing more to do. */
1592 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1593 if (var_finalized_p (primary_vtbl))
1595 /* Ignore dummy vtables made by get_vtable_decl. */
1596 if (TREE_TYPE (primary_vtbl) == void_type_node)
1599 /* On some targets, we cannot determine the key method until the end
1600 of the translation unit -- which is when this function is
1602 if (!targetm.cxx.key_method_may_be_inline ())
1603 determine_key_method (ctype);
1605 /* See if any of the vtables are needed. */
1606 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1608 import_export_decl (vtbl);
1609 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1614 /* If the references to this class' vtables are optimized away,
1615 still emit the appropriate debugging information. See
1617 if (DECL_COMDAT (primary_vtbl)
1618 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1619 note_debug_info_needed (ctype);
1623 /* The ABI requires that we emit all of the vtables if we emit any
1625 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1627 /* Mark entities references from the virtual table as used. */
1628 mark_vtable_entries (vtbl);
1630 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1632 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1634 /* It had better be all done at compile-time. */
1639 DECL_EXTERNAL (vtbl) = 0;
1640 rest_of_decl_compilation (vtbl, 1, 1);
1642 /* Because we're only doing syntax-checking, we'll never end up
1643 actually marking the variable as written. */
1644 if (flag_syntax_only)
1645 TREE_ASM_WRITTEN (vtbl) = 1;
1648 /* Since we're writing out the vtable here, also write the debug
1650 note_debug_info_needed (ctype);
1655 /* A special return value from type_visibility meaning internal
1658 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1660 /* walk_tree helper function for type_visibility. */
1663 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1665 int *vis_p = (int *)data;
1670 else if (CLASS_TYPE_P (*tp))
1672 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1674 *vis_p = VISIBILITY_ANON;
1677 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1678 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1683 /* Returns the visibility of TYPE, which is the minimum visibility of its
1687 type_visibility (tree type)
1689 int vis = VISIBILITY_DEFAULT;
1690 cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
1694 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1695 specified (or if VISIBILITY is static). */
1698 constrain_visibility (tree decl, int visibility)
1700 if (visibility == VISIBILITY_ANON)
1702 /* extern "C" declarations aren't affected by the anonymous
1704 if (!DECL_EXTERN_C_P (decl))
1706 TREE_PUBLIC (decl) = 0;
1707 DECL_ONE_ONLY (decl) = 0;
1708 DECL_INTERFACE_KNOWN (decl) = 1;
1709 if (DECL_LANG_SPECIFIC (decl))
1710 DECL_NOT_REALLY_EXTERN (decl) = 1;
1713 else if (visibility > DECL_VISIBILITY (decl)
1714 && !DECL_VISIBILITY_SPECIFIED (decl))
1716 DECL_VISIBILITY (decl) = visibility;
1722 /* Constrain the visibility of DECL based on the visibility of its template
1726 constrain_visibility_for_template (tree decl, tree targs)
1728 /* If this is a template instantiation, check the innermost
1729 template args for visibility constraints. The outer template
1730 args are covered by the class check. */
1731 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1733 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1737 tree arg = TREE_VEC_ELT (args, i-1);
1739 vis = type_visibility (arg);
1740 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1743 if (TREE_CODE (arg) == ADDR_EXPR)
1744 arg = TREE_OPERAND (arg, 0);
1745 if (TREE_CODE (arg) == VAR_DECL
1746 || TREE_CODE (arg) == FUNCTION_DECL)
1748 if (! TREE_PUBLIC (arg))
1749 vis = VISIBILITY_ANON;
1751 vis = DECL_VISIBILITY (arg);
1755 constrain_visibility (decl, vis);
1759 /* Like c_determine_visibility, but with additional C++-specific
1762 Function-scope entities can rely on the function's visibility because
1763 it is set in start_preparsed_function.
1765 Class-scope entities cannot rely on the class's visibility until the end
1766 of the enclosing class definition.
1768 Note that because namespaces have multiple independent definitions,
1769 namespace visibility is handled elsewhere using the #pragma visibility
1770 machinery rather than by decorating the namespace declaration.
1772 The goal is for constraints from the type to give a diagnostic, and
1773 other constraints to be applied silently. */
1776 determine_visibility (tree decl)
1778 tree class_type = NULL_TREE;
1781 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1783 /* Only relevant for names with external linkage. */
1784 if (!TREE_PUBLIC (decl))
1787 /* Cloned constructors and destructors get the same visibility as
1788 the underlying function. That should be set up in
1789 maybe_clone_body. */
1790 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1792 if (TREE_CODE (decl) == TYPE_DECL)
1794 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1795 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1796 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1801 else if (DECL_LANG_SPECIFIC (decl))
1802 use_template = DECL_USE_TEMPLATE (decl);
1806 /* If DECL is a member of a class, visibility specifiers on the
1807 class can influence the visibility of the DECL. */
1808 if (DECL_CLASS_SCOPE_P (decl))
1809 class_type = DECL_CONTEXT (decl);
1812 /* Not a class member. */
1814 /* Virtual tables have DECL_CONTEXT set to their associated class,
1815 so they are automatically handled above. */
1816 gcc_assert (TREE_CODE (decl) != VAR_DECL
1817 || !DECL_VTABLE_OR_VTT_P (decl));
1819 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1821 /* Local statics and classes get the visibility of their
1822 containing function by default, except that
1823 -fvisibility-inlines-hidden doesn't affect them. */
1824 tree fn = DECL_CONTEXT (decl);
1825 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1827 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1828 DECL_VISIBILITY_SPECIFIED (decl) =
1829 DECL_VISIBILITY_SPECIFIED (fn);
1832 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1834 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1835 but have no TEMPLATE_INFO, so don't try to check it. */
1838 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)
1839 && flag_visibility_ms_compat)
1841 /* Under -fvisibility-ms-compat, types are visible by default,
1842 even though their contents aren't. */
1843 tree underlying_type = TREE_TYPE (DECL_NAME (decl));
1844 int underlying_vis = type_visibility (underlying_type);
1845 if (underlying_vis == VISIBILITY_ANON
1846 || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))
1847 constrain_visibility (decl, underlying_vis);
1849 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1851 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1853 /* tinfo visibility is based on the type it's for. */
1854 constrain_visibility
1855 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1857 else if (use_template)
1858 /* Template instantiations and specializations get visibility based
1859 on their template unless they override it with an attribute. */;
1860 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1862 /* Set default visibility to whatever the user supplied with
1863 #pragma GCC visibility or a namespace visibility attribute. */
1864 DECL_VISIBILITY (decl) = default_visibility;
1865 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1871 /* If the specialization doesn't specify visibility, use the
1872 visibility from the template. */
1873 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1874 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1875 : DECL_TEMPLATE_INFO (decl));
1876 tree args = TI_ARGS (tinfo);
1878 if (args != error_mark_node)
1880 int depth = TMPL_ARGS_DEPTH (args);
1881 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1883 if (!DECL_VISIBILITY_SPECIFIED (decl))
1885 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1886 DECL_VISIBILITY_SPECIFIED (decl)
1887 = DECL_VISIBILITY_SPECIFIED (pattern);
1890 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1891 if (args && depth > template_class_depth (class_type))
1892 /* Limit visibility based on its template arguments. */
1893 constrain_visibility_for_template (decl, args);
1898 determine_visibility_from_class (decl, class_type);
1900 if (decl_anon_ns_mem_p (decl))
1901 /* Names in an anonymous namespace get internal linkage.
1902 This might change once we implement export. */
1903 constrain_visibility (decl, VISIBILITY_ANON);
1904 else if (TREE_CODE (decl) != TYPE_DECL)
1906 /* Propagate anonymity from type to decl. */
1907 int tvis = type_visibility (TREE_TYPE (decl));
1908 if (tvis == VISIBILITY_ANON
1909 || ! DECL_VISIBILITY_SPECIFIED (decl))
1910 constrain_visibility (decl, tvis);
1914 /* By default, static data members and function members receive
1915 the visibility of their containing class. */
1918 determine_visibility_from_class (tree decl, tree class_type)
1920 if (DECL_VISIBILITY_SPECIFIED (decl))
1923 if (visibility_options.inlines_hidden
1924 /* Don't do this for inline templates; specializations might not be
1925 inline, and we don't want them to inherit the hidden
1926 visibility. We'll set it here for all inline instantiations. */
1927 && !processing_template_decl
1928 && TREE_CODE (decl) == FUNCTION_DECL
1929 && DECL_DECLARED_INLINE_P (decl)
1930 && (! DECL_LANG_SPECIFIC (decl)
1931 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1932 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1935 /* Default to the class visibility. */
1936 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1937 DECL_VISIBILITY_SPECIFIED (decl)
1938 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1941 /* Give the target a chance to override the visibility associated
1943 if (TREE_CODE (decl) == VAR_DECL
1944 && (DECL_TINFO_P (decl)
1945 || (DECL_VTABLE_OR_VTT_P (decl)
1946 /* Construction virtual tables are not exported because
1947 they cannot be referred to from other object files;
1948 their name is not standardized by the ABI. */
1949 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1950 && TREE_PUBLIC (decl)
1951 && !DECL_REALLY_EXTERN (decl)
1952 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1953 targetm.cxx.determine_class_data_visibility (decl);
1956 /* Constrain the visibility of a class TYPE based on the visibility of its
1957 field types. Warn if any fields require lesser visibility. */
1960 constrain_class_visibility (tree type)
1966 int vis = type_visibility (type);
1968 if (vis == VISIBILITY_ANON
1969 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1972 /* Don't warn about visibility if the class has explicit visibility. */
1973 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1974 vis = VISIBILITY_INTERNAL;
1976 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1977 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1979 tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
1980 int subvis = type_visibility (ftype);
1982 if (subvis == VISIBILITY_ANON)
1984 if (!in_main_input_context ())
1986 %qT has a field %qD whose type uses the anonymous namespace",
1989 else if (IS_AGGR_TYPE (ftype)
1990 && vis < VISIBILITY_HIDDEN
1991 && subvis >= VISIBILITY_HIDDEN)
1992 warning (OPT_Wattributes, "\
1993 %qT declared with greater visibility than the type of its field %qD",
1997 binfo = TYPE_BINFO (type);
1998 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
2000 int subvis = type_visibility (TREE_TYPE (t));
2002 if (subvis == VISIBILITY_ANON)
2004 if (!in_main_input_context())
2006 %qT has a base %qT whose type uses the anonymous namespace",
2007 type, TREE_TYPE (t));
2009 else if (vis < VISIBILITY_HIDDEN
2010 && subvis >= VISIBILITY_HIDDEN)
2011 warning (OPT_Wattributes, "\
2012 %qT declared with greater visibility than its base %qT",
2013 type, TREE_TYPE (t));
2017 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2018 for DECL has not already been determined, do so now by setting
2019 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2020 function is called entities with vague linkage whose definitions
2021 are available must have TREE_PUBLIC set.
2023 If this function decides to place DECL in COMDAT, it will set
2024 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2025 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2026 callers defer that decision until it is clear that DECL is actually
2030 import_export_decl (tree decl)
2035 tree class_type = NULL_TREE;
2037 if (DECL_INTERFACE_KNOWN (decl))
2040 /* We cannot determine what linkage to give to an entity with vague
2041 linkage until the end of the file. For example, a virtual table
2042 for a class will be defined if and only if the key method is
2043 defined in this translation unit. As a further example, consider
2044 that when compiling a translation unit that uses PCH file with
2045 "-frepo" it would be incorrect to make decisions about what
2046 entities to emit when building the PCH; those decisions must be
2047 delayed until the repository information has been processed. */
2048 gcc_assert (at_eof);
2049 /* Object file linkage for explicit instantiations is handled in
2050 mark_decl_instantiated. For static variables in functions with
2051 vague linkage, maybe_commonize_var is used.
2053 Therefore, the only declarations that should be provided to this
2054 function are those with external linkage that are:
2056 * implicit instantiations of function templates
2060 * implicit instantiations of static data members of class
2067 Furthermore, all entities that reach this point must have a
2068 definition available in this translation unit.
2070 The following assertions check these conditions. */
2071 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
2072 || TREE_CODE (decl) == VAR_DECL);
2073 /* Any code that creates entities with TREE_PUBLIC cleared should
2074 also set DECL_INTERFACE_KNOWN. */
2075 gcc_assert (TREE_PUBLIC (decl));
2076 if (TREE_CODE (decl) == FUNCTION_DECL)
2077 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2078 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
2079 || DECL_DECLARED_INLINE_P (decl));
2081 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
2082 || DECL_VTABLE_OR_VTT_P (decl)
2083 || DECL_TINFO_P (decl));
2084 /* Check that a definition of DECL is available in this translation
2086 gcc_assert (!DECL_REALLY_EXTERN (decl));
2088 /* Assume that DECL will not have COMDAT linkage. */
2090 /* Assume that DECL will not be imported into this translation
2094 /* See if the repository tells us whether or not to emit DECL in
2095 this translation unit. */
2096 emit_p = repo_emit_p (decl);
2099 else if (emit_p == 1)
2101 /* The repository indicates that this entity should be defined
2102 here. Make sure the back end honors that request. */
2103 if (TREE_CODE (decl) == VAR_DECL)
2105 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
2106 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2109 FOR_EACH_CLONE (clone, decl)
2110 mark_needed (clone);
2114 /* Output the definition as an ordinary strong definition. */
2115 DECL_EXTERNAL (decl) = 0;
2116 DECL_INTERFACE_KNOWN (decl) = 1;
2121 /* We have already decided what to do with this DECL; there is no
2122 need to check anything further. */
2124 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2126 class_type = DECL_CONTEXT (decl);
2127 import_export_class (class_type);
2128 if (TYPE_FOR_JAVA (class_type))
2130 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2131 && CLASSTYPE_INTERFACE_ONLY (class_type))
2133 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2134 && !CLASSTYPE_USE_TEMPLATE (class_type)
2135 && CLASSTYPE_KEY_METHOD (class_type)
2136 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2137 /* The ABI requires that all virtual tables be emitted with
2138 COMDAT linkage. However, on systems where COMDAT symbols
2139 don't show up in the table of contents for a static
2140 archive, or on systems without weak symbols (where we
2141 approximate COMDAT linkage by using internal linkage), the
2142 linker will report errors about undefined symbols because
2143 it will not see the virtual table definition. Therefore,
2144 in the case that we know that the virtual table will be
2145 emitted in only one translation unit, we make the virtual
2146 table an ordinary definition with external linkage. */
2147 DECL_EXTERNAL (decl) = 0;
2148 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2150 /* CLASS_TYPE is being exported from this translation unit,
2151 so DECL should be defined here. */
2152 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2153 /* If a class is declared in a header with the "extern
2154 template" extension, then it will not be instantiated,
2155 even in translation units that would normally require
2156 it. Often such classes are explicitly instantiated in
2157 one translation unit. Therefore, the explicit
2158 instantiation must be made visible to other translation
2160 DECL_EXTERNAL (decl) = 0;
2163 /* The generic C++ ABI says that class data is always
2164 COMDAT, even if there is a key function. Some
2165 variants (e.g., the ARM EABI) says that class data
2166 only has COMDAT linkage if the class data might be
2167 emitted in more than one translation unit. When the
2168 key method can be inline and is inline, we still have
2169 to arrange for comdat even though
2170 class_data_always_comdat is false. */
2171 if (!CLASSTYPE_KEY_METHOD (class_type)
2172 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2173 || targetm.cxx.class_data_always_comdat ())
2175 /* The ABI requires COMDAT linkage. Normally, we
2176 only emit COMDAT things when they are needed;
2177 make sure that we realize that this entity is
2184 else if (!flag_implicit_templates
2185 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2190 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2192 tree type = TREE_TYPE (DECL_NAME (decl));
2193 if (CLASS_TYPE_P (type))
2196 import_export_class (type);
2197 if (CLASSTYPE_INTERFACE_KNOWN (type)
2198 && TYPE_POLYMORPHIC_P (type)
2199 && CLASSTYPE_INTERFACE_ONLY (type)
2200 /* If -fno-rtti was specified, then we cannot be sure
2201 that RTTI information will be emitted with the
2202 virtual table of the class, so we must emit it
2203 wherever it is used. */
2208 if (CLASSTYPE_INTERFACE_KNOWN (type)
2209 && !CLASSTYPE_INTERFACE_ONLY (type))
2211 comdat_p = (targetm.cxx.class_data_always_comdat ()
2212 || (CLASSTYPE_KEY_METHOD (type)
2213 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2218 DECL_EXTERNAL (decl) = 0;
2228 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2229 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2231 /* DECL is an implicit instantiation of a function or static
2233 if ((flag_implicit_templates
2234 && !flag_use_repository)
2235 || (flag_implicit_inline_templates
2236 && TREE_CODE (decl) == FUNCTION_DECL
2237 && DECL_DECLARED_INLINE_P (decl)))
2240 /* If we are not implicitly generating templates, then mark
2241 this entity as undefined in this translation unit. */
2244 else if (DECL_FUNCTION_MEMBER_P (decl))
2246 if (!DECL_DECLARED_INLINE_P (decl))
2248 tree ctype = DECL_CONTEXT (decl);
2249 import_export_class (ctype);
2250 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2252 DECL_NOT_REALLY_EXTERN (decl)
2253 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2254 || (DECL_DECLARED_INLINE_P (decl)
2255 && ! flag_implement_inlines
2256 && !DECL_VINDEX (decl)));
2258 if (!DECL_NOT_REALLY_EXTERN (decl))
2259 DECL_EXTERNAL (decl) = 1;
2261 /* Always make artificials weak. */
2262 if (DECL_ARTIFICIAL (decl) && flag_weak)
2265 maybe_make_one_only (decl);
2276 /* If we are importing DECL into this translation unit, mark is
2277 an undefined here. */
2278 DECL_EXTERNAL (decl) = 1;
2279 DECL_NOT_REALLY_EXTERN (decl) = 0;
2283 /* If we decided to put DECL in COMDAT, mark it accordingly at
2285 comdat_linkage (decl);
2288 DECL_INTERFACE_KNOWN (decl) = 1;
2291 /* Return an expression that performs the destruction of DECL, which
2292 must be a VAR_DECL whose type has a non-trivial destructor, or is
2293 an array whose (innermost) elements have a non-trivial destructor. */
2296 build_cleanup (tree decl)
2299 tree type = TREE_TYPE (decl);
2301 /* This function should only be called for declarations that really
2302 require cleanups. */
2303 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2305 /* Treat all objects with destructors as used; the destructor may do
2306 something substantive. */
2309 if (TREE_CODE (type) == ARRAY_TYPE)
2312 temp = build_address (decl);
2313 temp = build_delete (TREE_TYPE (temp), temp,
2314 sfk_complete_destructor,
2315 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2319 /* Returns the initialization guard variable for the variable DECL,
2320 which has static storage duration. */
2323 get_guard (tree decl)
2328 sname = mangle_guard_variable (decl);
2329 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2334 /* We use a type that is big enough to contain a mutex as well
2335 as an integer counter. */
2336 guard_type = targetm.cxx.guard_type ();
2337 guard = build_decl (VAR_DECL, sname, guard_type);
2339 /* The guard should have the same linkage as what it guards. */
2340 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2341 TREE_STATIC (guard) = TREE_STATIC (decl);
2342 DECL_COMMON (guard) = DECL_COMMON (decl);
2343 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2344 if (TREE_PUBLIC (decl))
2345 DECL_WEAK (guard) = DECL_WEAK (decl);
2346 DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
2347 DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
2349 DECL_ARTIFICIAL (guard) = 1;
2350 DECL_IGNORED_P (guard) = 1;
2351 TREE_USED (guard) = 1;
2352 pushdecl_top_level_and_finish (guard, NULL_TREE);
2357 /* Return those bits of the GUARD variable that should be set when the
2358 guarded entity is actually initialized. */
2361 get_guard_bits (tree guard)
2363 if (!targetm.cxx.guard_mask_bit ())
2365 /* We only set the first byte of the guard, in order to leave room
2366 for a mutex in the high-order bits. */
2367 guard = build1 (ADDR_EXPR,
2368 build_pointer_type (TREE_TYPE (guard)),
2370 guard = build1 (NOP_EXPR,
2371 build_pointer_type (char_type_node),
2373 guard = build1 (INDIRECT_REF, char_type_node, guard);
2379 /* Return an expression which determines whether or not the GUARD
2380 variable has already been initialized. */
2383 get_guard_cond (tree guard)
2387 /* Check to see if the GUARD is zero. */
2388 guard = get_guard_bits (guard);
2390 /* Mask off all but the low bit. */
2391 if (targetm.cxx.guard_mask_bit ())
2393 guard_value = integer_one_node;
2394 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2395 guard_value = convert (TREE_TYPE (guard), guard_value);
2396 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2399 guard_value = integer_zero_node;
2400 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2401 guard_value = convert (TREE_TYPE (guard), guard_value);
2402 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2405 /* Return an expression which sets the GUARD variable, indicating that
2406 the variable being guarded has been initialized. */
2409 set_guard (tree guard)
2413 /* Set the GUARD to one. */
2414 guard = get_guard_bits (guard);
2415 guard_init = integer_one_node;
2416 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2417 guard_init = convert (TREE_TYPE (guard), guard_init);
2418 return build_modify_expr (guard, NOP_EXPR, guard_init);
2421 /* Start the process of running a particular set of global constructors
2422 or destructors. Subroutine of do_[cd]tors. */
2425 start_objects (int method_type, int initp)
2431 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2433 if (initp != DEFAULT_INIT_PRIORITY)
2443 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2446 sprintf (type, "%c", method_type);
2448 fndecl = build_lang_decl (FUNCTION_DECL,
2449 get_file_function_name (type),
2450 build_function_type (void_type_node,
2452 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2454 TREE_PUBLIC (current_function_decl) = 0;
2456 /* Mark as artificial because it's not explicitly in the user's
2458 DECL_ARTIFICIAL (current_function_decl) = 1;
2460 /* Mark this declaration as used to avoid spurious warnings. */
2461 TREE_USED (current_function_decl) = 1;
2463 /* Mark this function as a global constructor or destructor. */
2464 if (method_type == 'I')
2465 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2467 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2468 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2470 body = begin_compound_stmt (BCS_FN_BODY);
2475 /* Finish the process of running a particular set of global constructors
2476 or destructors. Subroutine of do_[cd]tors. */
2479 finish_objects (int method_type, int initp, tree body)
2484 finish_compound_stmt (body);
2485 fn = finish_function (0);
2487 if (method_type == 'I')
2489 DECL_STATIC_CONSTRUCTOR (fn) = 1;
2490 decl_init_priority_insert (fn, initp);
2494 DECL_STATIC_DESTRUCTOR (fn) = 1;
2495 decl_fini_priority_insert (fn, initp);
2498 expand_or_defer_fn (fn);
2501 /* The names of the parameters to the function created to handle
2502 initializations and destructions for objects with static storage
2504 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2505 #define PRIORITY_IDENTIFIER "__priority"
2507 /* The name of the function we create to handle initializations and
2508 destructions for objects with static storage duration. */
2509 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2511 /* The declaration for the __INITIALIZE_P argument. */
2512 static GTY(()) tree initialize_p_decl;
2514 /* The declaration for the __PRIORITY argument. */
2515 static GTY(()) tree priority_decl;
2517 /* The declaration for the static storage duration function. */
2518 static GTY(()) tree ssdf_decl;
2520 /* All the static storage duration functions created in this
2521 translation unit. */
2522 static GTY(()) VEC(tree,gc) *ssdf_decls;
2524 /* A map from priority levels to information about that priority
2525 level. There may be many such levels, so efficient lookup is
2527 static splay_tree priority_info_map;
2529 /* Begins the generation of the function that will handle all
2530 initialization and destruction of objects with static storage
2531 duration. The function generated takes two parameters of type
2532 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2533 nonzero, it performs initializations. Otherwise, it performs
2534 destructions. It only performs those initializations or
2535 destructions with the indicated __PRIORITY. The generated function
2538 It is assumed that this function will only be called once per
2539 translation unit. */
2542 start_static_storage_duration_function (unsigned count)
2547 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2549 /* Create the identifier for this function. It will be of the form
2550 SSDF_IDENTIFIER_<number>. */
2551 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2553 /* Create the parameters. */
2554 parm_types = void_list_node;
2555 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2556 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2557 type = build_function_type (void_type_node, parm_types);
2559 /* Create the FUNCTION_DECL itself. */
2560 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2561 get_identifier (id),
2563 TREE_PUBLIC (ssdf_decl) = 0;
2564 DECL_ARTIFICIAL (ssdf_decl) = 1;
2565 DECL_INLINE (ssdf_decl) = 1;
2567 /* Put this function in the list of functions to be called from the
2568 static constructors and destructors. */
2571 ssdf_decls = VEC_alloc (tree, gc, 32);
2573 /* Take this opportunity to initialize the map from priority
2574 numbers to information about that priority level. */
2575 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2576 /*delete_key_fn=*/0,
2577 /*delete_value_fn=*/
2578 (splay_tree_delete_value_fn) &free);
2580 /* We always need to generate functions for the
2581 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2582 priorities later, we'll be sure to find the
2583 DEFAULT_INIT_PRIORITY. */
2584 get_priority_info (DEFAULT_INIT_PRIORITY);
2587 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2589 /* Create the argument list. */
2590 initialize_p_decl = cp_build_parm_decl
2591 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2592 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2593 TREE_USED (initialize_p_decl) = 1;
2594 priority_decl = cp_build_parm_decl
2595 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2596 DECL_CONTEXT (priority_decl) = ssdf_decl;
2597 TREE_USED (priority_decl) = 1;
2599 TREE_CHAIN (initialize_p_decl) = priority_decl;
2600 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2602 /* Put the function in the global scope. */
2603 pushdecl (ssdf_decl);
2605 /* Start the function itself. This is equivalent to declaring the
2608 static void __ssdf (int __initialize_p, init __priority_p);
2610 It is static because we only need to call this function from the
2611 various constructor and destructor functions for this module. */
2612 start_preparsed_function (ssdf_decl,
2613 /*attrs=*/NULL_TREE,
2616 /* Set up the scope of the outermost block in the function. */
2617 body = begin_compound_stmt (BCS_FN_BODY);
2622 /* Finish the generation of the function which performs initialization
2623 and destruction of objects with static storage duration. After
2624 this point, no more such objects can be created. */
2627 finish_static_storage_duration_function (tree body)
2629 /* Close out the function. */
2630 finish_compound_stmt (body);
2631 expand_or_defer_fn (finish_function (0));
2634 /* Return the information about the indicated PRIORITY level. If no
2635 code to handle this level has yet been generated, generate the
2636 appropriate prologue. */
2638 static priority_info
2639 get_priority_info (int priority)
2644 n = splay_tree_lookup (priority_info_map,
2645 (splay_tree_key) priority);
2648 /* Create a new priority information structure, and insert it
2650 pi = XNEW (struct priority_info_s);
2651 pi->initializations_p = 0;
2652 pi->destructions_p = 0;
2653 splay_tree_insert (priority_info_map,
2654 (splay_tree_key) priority,
2655 (splay_tree_value) pi);
2658 pi = (priority_info) n->value;
2663 /* The effective initialization priority of a DECL. */
2665 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2666 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2667 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2669 /* Whether a DECL needs a guard to protect it against multiple
2672 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2673 || DECL_ONE_ONLY (decl) \
2674 || DECL_WEAK (decl)))
2676 /* Set up to handle the initialization or destruction of DECL. If
2677 INITP is nonzero, we are initializing the variable. Otherwise, we
2678 are destroying it. */
2681 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2683 tree guard_if_stmt = NULL_TREE;
2686 /* If we are supposed to destruct and there's a trivial destructor,
2687 nothing has to be done. */
2689 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2692 /* Trick the compiler into thinking we are at the file and line
2693 where DECL was declared so that error-messages make sense, and so
2694 that the debugger will show somewhat sensible file and line
2696 input_location = DECL_SOURCE_LOCATION (decl);
2702 Access control for implicit calls to the constructors,
2703 the conversion functions, or the destructor called to
2704 create and destroy a static data member is performed as
2705 if these calls appeared in the scope of the member's
2708 we pretend we are in a static member function of the class of
2709 which the DECL is a member. */
2710 if (member_p (decl))
2712 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2713 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2716 /* Assume we don't need a guard. */
2718 /* We need a guard if this is an object with external linkage that
2719 might be initialized in more than one place. (For example, a
2720 static data member of a template, when the data member requires
2722 if (NEEDS_GUARD_P (decl))
2726 guard = get_guard (decl);
2728 /* When using __cxa_atexit, we just check the GUARD as we would
2729 for a local static. */
2730 if (flag_use_cxa_atexit)
2732 /* When using __cxa_atexit, we never try to destroy
2733 anything from a static destructor. */
2735 guard_cond = get_guard_cond (guard);
2737 /* If we don't have __cxa_atexit, then we will be running
2738 destructors from .fini sections, or their equivalents. So,
2739 we need to know how many times we've tried to initialize this
2740 object. We do initializations only if the GUARD is zero,
2741 i.e., if we are the first to initialize the variable. We do
2742 destructions only if the GUARD is one, i.e., if we are the
2743 last to destroy the variable. */
2746 = cp_build_binary_op (EQ_EXPR,
2747 build_unary_op (PREINCREMENT_EXPR,
2753 = cp_build_binary_op (EQ_EXPR,
2754 build_unary_op (PREDECREMENT_EXPR,
2759 guard_if_stmt = begin_if_stmt ();
2760 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2764 /* If we're using __cxa_atexit, we have not already set the GUARD,
2765 so we must do so now. */
2766 if (guard && initp && flag_use_cxa_atexit)
2767 finish_expr_stmt (set_guard (guard));
2769 /* Perform the initialization or destruction. */
2773 finish_expr_stmt (init);
2775 /* If we're using __cxa_atexit, register a function that calls the
2776 destructor for the object. */
2777 if (flag_use_cxa_atexit)
2778 finish_expr_stmt (register_dtor_fn (decl));
2781 finish_expr_stmt (build_cleanup (decl));
2783 /* Finish the guard if-stmt, if necessary. */
2786 finish_then_clause (guard_if_stmt);
2787 finish_if_stmt (guard_if_stmt);
2790 /* Now that we're done with DECL we don't need to pretend to be a
2791 member of its class any longer. */
2792 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2793 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2796 /* Generate code to do the initialization or destruction of the decls in VARS,
2797 a TREE_LIST of VAR_DECL with static storage duration.
2798 Whether initialization or destruction is performed is specified by INITP. */
2801 do_static_initialization_or_destruction (tree vars, bool initp)
2803 tree node, init_if_stmt, cond;
2805 /* Build the outer if-stmt to check for initialization or destruction. */
2806 init_if_stmt = begin_if_stmt ();
2807 cond = initp ? integer_one_node : integer_zero_node;
2808 cond = cp_build_binary_op (EQ_EXPR,
2811 finish_if_stmt_cond (cond, init_if_stmt);
2815 tree decl = TREE_VALUE (node);
2816 tree priority_if_stmt;
2820 /* If we don't need a destructor, there's nothing to do. Avoid
2821 creating a possibly empty if-stmt. */
2822 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2824 node = TREE_CHAIN (node);
2828 /* Remember that we had an initialization or finalization at this
2830 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2831 pi = get_priority_info (priority);
2833 pi->initializations_p = 1;
2835 pi->destructions_p = 1;
2837 /* Conditionalize this initialization on being in the right priority
2838 and being initializing/finalizing appropriately. */
2839 priority_if_stmt = begin_if_stmt ();
2840 cond = cp_build_binary_op (EQ_EXPR,
2842 build_int_cst (NULL_TREE, priority));
2843 finish_if_stmt_cond (cond, priority_if_stmt);
2845 /* Process initializers with same priority. */
2847 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2848 node = TREE_CHAIN (node))
2849 /* Do one initialization or destruction. */
2850 one_static_initialization_or_destruction (TREE_VALUE (node),
2851 TREE_PURPOSE (node), initp);
2853 /* Finish up the priority if-stmt body. */
2854 finish_then_clause (priority_if_stmt);
2855 finish_if_stmt (priority_if_stmt);
2859 /* Finish up the init/destruct if-stmt body. */
2860 finish_then_clause (init_if_stmt);
2861 finish_if_stmt (init_if_stmt);
2864 /* VARS is a list of variables with static storage duration which may
2865 need initialization and/or finalization. Remove those variables
2866 that don't really need to be initialized or finalized, and return
2867 the resulting list. The order in which the variables appear in
2868 VARS is in reverse order of the order in which they should actually
2869 be initialized. The list we return is in the unreversed order;
2870 i.e., the first variable should be initialized first. */
2873 prune_vars_needing_no_initialization (tree *vars)
2876 tree result = NULL_TREE;
2881 tree decl = TREE_VALUE (t);
2882 tree init = TREE_PURPOSE (t);
2884 /* Deal gracefully with error. */
2885 if (decl == error_mark_node)
2887 var = &TREE_CHAIN (t);
2891 /* The only things that can be initialized are variables. */
2892 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2894 /* If this object is not defined, we don't need to do anything
2896 if (DECL_EXTERNAL (decl))
2898 var = &TREE_CHAIN (t);
2902 /* Also, if the initializer already contains errors, we can bail
2904 if (init && TREE_CODE (init) == TREE_LIST
2905 && value_member (error_mark_node, init))
2907 var = &TREE_CHAIN (t);
2911 /* This variable is going to need initialization and/or
2912 finalization, so we add it to the list. */
2913 *var = TREE_CHAIN (t);
2914 TREE_CHAIN (t) = result;
2921 /* Make sure we have told the back end about all the variables in
2925 write_out_vars (tree vars)
2929 for (v = vars; v; v = TREE_CHAIN (v))
2931 tree var = TREE_VALUE (v);
2932 if (!var_finalized_p (var))
2934 import_export_decl (var);
2935 rest_of_decl_compilation (var, 1, 1);
2940 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2941 (otherwise) that will initialize all global objects with static
2942 storage duration having the indicated PRIORITY. */
2945 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2954 input_location = *locus;
2955 #ifdef USE_MAPPED_LOCATION
2961 /* We use `I' to indicate initialization and `D' to indicate
2963 function_key = constructor_p ? 'I' : 'D';
2965 /* We emit the function lazily, to avoid generating empty
2966 global constructors and destructors. */
2969 /* For Objective-C++, we may need to initialize metadata found in this module.
2970 This must be done _before_ any other static initializations. */
2971 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2972 && constructor_p && objc_static_init_needed_p ())
2974 body = start_objects (function_key, priority);
2975 objc_generate_static_init_call (NULL_TREE);
2978 /* Call the static storage duration function with appropriate
2980 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2982 /* Calls to pure or const functions will expand to nothing. */
2983 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2986 body = start_objects (function_key, priority);
2988 arguments = tree_cons (NULL_TREE,
2989 build_int_cst (NULL_TREE, priority),
2991 arguments = tree_cons (NULL_TREE,
2992 build_int_cst (NULL_TREE, constructor_p),
2994 finish_expr_stmt (build_function_call (fndecl, arguments));
2998 /* Close out the function. */
3000 finish_objects (function_key, priority, body);
3003 /* Generate constructor and destructor functions for the priority
3007 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
3009 location_t *locus = (location_t *) data;
3010 int priority = (int) n->key;
3011 priority_info pi = (priority_info) n->value;
3013 /* Generate the functions themselves, but only if they are really
3015 if (pi->initializations_p)
3016 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
3017 if (pi->destructions_p)
3018 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
3020 /* Keep iterating. */
3024 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
3025 decls referenced from front-end specific constructs; it will be called
3026 only for language-specific tree nodes.
3028 Here we must deal with member pointers. */
3031 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED)
3035 switch (TREE_CODE (t))
3038 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
3039 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
3042 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
3043 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
3046 if (DECL_VTABLE_OR_VTT_P (t))
3048 /* The ABI requires that all virtual tables be emitted
3049 whenever one of them is. */
3051 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
3053 vtbl = TREE_CHAIN (vtbl))
3054 mark_decl_referenced (vtbl);
3056 else if (DECL_CONTEXT (t)
3057 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
3058 /* If we need a static variable in a function, then we
3059 need the containing function. */
3060 mark_decl_referenced (DECL_CONTEXT (t));
3069 /* Java requires that we be able to reference a local address for a
3070 method, and not be confused by PLT entries. If hidden aliases are
3071 supported, emit one for each java function that we've emitted. */
3074 build_java_method_aliases (void)
3076 struct cgraph_node *node;
3078 #ifndef HAVE_GAS_HIDDEN
3082 for (node = cgraph_nodes; node ; node = node->next)
3084 tree fndecl = node->decl;
3086 if (TREE_ASM_WRITTEN (fndecl)
3087 && DECL_CONTEXT (fndecl)
3088 && TYPE_P (DECL_CONTEXT (fndecl))
3089 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3090 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3092 /* Mangle the name in a predictable way; we need to reference
3093 this from a java compiled object file. */
3094 tree oid, nid, alias;
3098 oid = DECL_ASSEMBLER_NAME (fndecl);
3099 oname = IDENTIFIER_POINTER (oid);
3100 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3101 nname = ACONCAT (("_ZGA", oname+2, NULL));
3102 nid = get_identifier (nname);
3104 alias = make_alias_for (fndecl, nid);
3105 TREE_PUBLIC (alias) = 1;
3106 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3108 assemble_alias (alias, oid);
3113 /* This routine is called at the end of compilation.
3114 Its job is to create all the code needed to initialize and
3115 destroy the global aggregates. We do the destruction
3116 first, since that way we only need to reverse the decls once. */
3119 cp_write_global_declarations (void)
3125 unsigned ssdf_count = 0;
3129 locus = input_location;
3132 /* Bad parse errors. Just forget about it. */
3133 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3137 c_common_write_pch ();
3139 #ifdef USE_MAPPED_LOCATION
3142 /* Otherwise, GDB can get confused, because in only knows
3143 about source for LINENO-1 lines. */
3147 /* We now have to write out all the stuff we put off writing out.
3150 o Template specializations that we have not yet instantiated,
3151 but which are needed.
3152 o Initialization and destruction for non-local objects with
3153 static storage duration. (Local objects with static storage
3154 duration are initialized when their scope is first entered,
3155 and are cleaned up via atexit.)
3156 o Virtual function tables.
3158 All of these may cause others to be needed. For example,
3159 instantiating one function may cause another to be needed, and
3160 generating the initializer for an object may cause templates to be
3161 instantiated, etc., etc. */
3163 timevar_push (TV_VARCONST);
3165 emit_support_tinfos ();
3174 /* If there are templates that we've put off instantiating, do
3176 instantiate_pending_templates (retries);
3179 /* Write out virtual tables as required. Note that writing out
3180 the virtual table for a template class may cause the
3181 instantiation of members of that class. If we write out
3182 vtables then we remove the class from our list so we don't
3183 have to look at it again. */
3185 while (keyed_classes != NULL_TREE
3186 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3189 keyed_classes = TREE_CHAIN (keyed_classes);
3195 tree next = TREE_CHAIN (t);
3199 if (maybe_emit_vtables (TREE_VALUE (next)))
3202 TREE_CHAIN (t) = TREE_CHAIN (next);
3207 next = TREE_CHAIN (t);
3211 /* Write out needed type info variables. We have to be careful
3212 looping through unemitted decls, because emit_tinfo_decl may
3213 cause other variables to be needed. New elements will be
3214 appended, and we remove from the vector those that actually
3216 for (i = VEC_length (tree, unemitted_tinfo_decls);
3217 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3218 if (emit_tinfo_decl (t))
3221 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3224 /* The list of objects with static storage duration is built up
3225 in reverse order. We clear STATIC_AGGREGATES so that any new
3226 aggregates added during the initialization of these will be
3227 initialized in the correct order when we next come around the
3229 vars = prune_vars_needing_no_initialization (&static_aggregates);
3233 /* We need to start a new initialization function each time
3234 through the loop. That's because we need to know which
3235 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3236 isn't computed until a function is finished, and written
3237 out. That's a deficiency in the back end. When this is
3238 fixed, these initialization functions could all become
3239 inline, with resulting performance improvements. */
3242 /* Set the line and file, so that it is obviously not from
3244 input_location = locus;
3245 ssdf_body = start_static_storage_duration_function (ssdf_count);
3247 /* Make sure the back end knows about all the variables. */
3248 write_out_vars (vars);
3250 /* First generate code to do all the initializations. */
3252 do_static_initialization_or_destruction (vars, /*initp=*/true);
3254 /* Then, generate code to do all the destructions. Do these
3255 in reverse order so that the most recently constructed
3256 variable is the first destroyed. If we're using
3257 __cxa_atexit, then we don't need to do this; functions
3258 were registered at initialization time to destroy the
3260 if (!flag_use_cxa_atexit && vars)
3262 vars = nreverse (vars);
3263 do_static_initialization_or_destruction (vars, /*initp=*/false);
3268 /* Finish up the static storage duration function for this
3270 input_location = locus;
3271 finish_static_storage_duration_function (ssdf_body);
3273 /* All those initializations and finalizations might cause
3274 us to need more inline functions, more template
3275 instantiations, etc. */
3278 #ifdef USE_MAPPED_LOCATION
3285 /* Go through the set of inline functions whose bodies have not
3286 been emitted yet. If out-of-line copies of these functions
3287 are required, emit them. */
3288 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3290 /* Does it need synthesizing? */
3291 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3292 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3294 /* Even though we're already at the top-level, we push
3295 there again. That way, when we pop back a few lines
3296 hence, all of our state is restored. Otherwise,
3297 finish_function doesn't clean things up, and we end
3298 up with CURRENT_FUNCTION_DECL set. */
3299 push_to_top_level ();
3300 /* The decl's location will mark where it was first
3301 needed. Save that so synthesize method can indicate
3302 where it was needed from, in case of error */
3303 input_location = DECL_SOURCE_LOCATION (decl);
3304 synthesize_method (decl);
3305 pop_from_top_level ();
3309 if (!DECL_SAVED_TREE (decl))
3312 /* We lie to the back end, pretending that some functions
3313 are not defined when they really are. This keeps these
3314 functions from being put out unnecessarily. But, we must
3315 stop lying when the functions are referenced, or if they
3316 are not comdat since they need to be put out now. If
3317 DECL_INTERFACE_KNOWN, then we have already set
3318 DECL_EXTERNAL appropriately, so there's no need to check
3319 again, and we do not want to clear DECL_EXTERNAL if a
3320 previous call to import_export_decl set it.
3322 This is done in a separate for cycle, because if some
3323 deferred function is contained in another deferred
3324 function later in deferred_fns varray,
3325 rest_of_compilation would skip this function and we
3326 really cannot expand the same function twice. */
3327 import_export_decl (decl);
3328 if (DECL_NOT_REALLY_EXTERN (decl)
3329 && DECL_INITIAL (decl)
3330 && decl_needed_p (decl))
3331 DECL_EXTERNAL (decl) = 0;
3333 /* If we're going to need to write this function out, and
3334 there's already a body for it, create RTL for it now.
3335 (There might be no body if this is a method we haven't
3336 gotten around to synthesizing yet.) */
3337 if (!DECL_EXTERNAL (decl)
3338 && decl_needed_p (decl)
3339 && !TREE_ASM_WRITTEN (decl)
3340 && !cgraph_node (decl)->local.finalized)
3342 /* We will output the function; no longer consider it in this
3344 DECL_DEFER_OUTPUT (decl) = 0;
3345 /* Generate RTL for this function now that we know we
3347 expand_or_defer_fn (decl);
3348 /* If we're compiling -fsyntax-only pretend that this
3349 function has been written out so that we don't try to
3351 if (flag_syntax_only)
3352 TREE_ASM_WRITTEN (decl) = 1;
3357 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3360 /* Static data members are just like namespace-scope globals. */
3361 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3363 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3365 import_export_decl (decl);
3366 /* If this static data member is needed, provide it to the
3368 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3369 DECL_EXTERNAL (decl) = 0;
3371 if (VEC_length (tree, pending_statics) != 0
3372 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3373 VEC_length (tree, pending_statics)))
3380 /* All used inline functions must have a definition at this point. */
3381 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3383 if (/* Check online inline functions that were actually used. */
3384 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3385 /* If the definition actually was available here, then the
3386 fact that the function was not defined merely represents
3387 that for some reason (use of a template repository,
3388 #pragma interface, etc.) we decided not to emit the
3390 && !DECL_INITIAL (decl)
3391 /* An explicit instantiation can be used to specify
3392 that the body is in another unit. It will have
3393 already verified there was a definition. */
3394 && !DECL_EXPLICIT_INSTANTIATION (decl))
3396 warning (0, "inline function %q+D used but never defined", decl);
3397 /* Avoid a duplicate warning from check_global_declaration_1. */
3398 TREE_NO_WARNING (decl) = 1;
3402 /* We give C linkage to static constructors and destructors. */
3403 push_lang_context (lang_name_c);
3405 /* Generate initialization and destruction functions for all
3406 priorities for which they are required. */
3407 if (priority_info_map)
3408 splay_tree_foreach (priority_info_map,
3409 generate_ctor_and_dtor_functions_for_priority,
3411 else if (c_dialect_objc () && objc_static_init_needed_p ())
3412 /* If this is obj-c++ and we need a static init, call
3413 generate_ctor_or_dtor_function. */
3414 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3415 DEFAULT_INIT_PRIORITY, &locus);
3417 /* We're done with the splay-tree now. */
3418 if (priority_info_map)
3419 splay_tree_delete (priority_info_map);
3421 /* Generate any missing aliases. */
3422 maybe_apply_pending_pragma_weaks ();
3424 /* We're done with static constructors, so we can go back to "C++"
3426 pop_lang_context ();
3428 cgraph_finalize_compilation_unit ();
3431 /* Now, issue warnings about static, but not defined, functions,
3432 etc., and emit debugging information. */
3433 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3434 if (VEC_length (tree, pending_statics) != 0)
3436 check_global_declarations (VEC_address (tree, pending_statics),
3437 VEC_length (tree, pending_statics));
3438 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3439 VEC_length (tree, pending_statics));
3442 /* Generate hidden aliases for Java. */
3443 build_java_method_aliases ();
3447 /* The entire file is now complete. If requested, dump everything
3451 FILE *stream = dump_begin (TDI_tu, &flags);
3455 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3456 dump_end (TDI_tu, stream);
3460 timevar_pop (TV_VARCONST);
3462 if (flag_detailed_statistics)
3464 dump_tree_statistics ();
3465 dump_time_statistics ();
3467 input_location = locus;
3469 #ifdef ENABLE_CHECKING
3470 validate_conversion_obstack ();
3471 #endif /* ENABLE_CHECKING */
3474 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3475 function to call in parse-tree form; it has not yet been
3476 semantically analyzed. ARGS are the arguments to the function.
3477 They have already been semantically analyzed. */
3480 build_offset_ref_call_from_tree (tree fn, tree args)
3489 object = TREE_OPERAND (fn, 0);
3491 if (processing_template_decl)
3493 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3494 || TREE_CODE (fn) == MEMBER_REF);
3495 if (type_dependent_expression_p (fn)
3496 || any_type_dependent_arguments_p (args))
3497 return build_nt_call_list (fn, args);
3499 /* Transform the arguments and add the implicit "this"
3500 parameter. That must be done before the FN is transformed
3501 because we depend on the form of FN. */
3502 args = build_non_dependent_args (args);
3503 object = build_non_dependent_expr (object);
3504 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3505 object = build_unary_op (ADDR_EXPR, object, 0);
3506 args = tree_cons (NULL_TREE, object, args);
3507 /* Now that the arguments are done, transform FN. */
3508 fn = build_non_dependent_expr (fn);
3511 /* A qualified name corresponding to a bound pointer-to-member is
3512 represented as an OFFSET_REF:
3514 struct B { void g(); };
3516 void B::g() { (this->*p)(); } */
3517 if (TREE_CODE (fn) == OFFSET_REF)
3519 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3520 fn = TREE_OPERAND (fn, 1);
3521 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3522 args = tree_cons (NULL_TREE, object_addr, args);
3525 expr = build_function_call (fn, args);
3526 if (processing_template_decl && expr != error_mark_node)
3527 return build_min_non_dep_call_list (expr, orig_fn, orig_args);
3533 check_default_args (tree x)
3535 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3536 bool saw_def = false;
3537 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3538 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3540 if (TREE_PURPOSE (arg))
3544 error ("default argument missing for parameter %P of %q+#D", i, x);
3545 TREE_PURPOSE (arg) = error_mark_node;
3550 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3551 If DECL is a specialization or implicitly declared class member,
3552 generate the actual definition. */
3555 mark_used (tree decl)
3557 HOST_WIDE_INT saved_processing_template_decl = 0;
3559 /* If DECL is a BASELINK for a single function, then treat it just
3560 like the DECL for the function. Otherwise, if the BASELINK is
3561 for an overloaded function, we don't know which function was
3562 actually used until after overload resolution. */
3563 if (TREE_CODE (decl) == BASELINK)
3565 decl = BASELINK_FUNCTIONS (decl);
3566 if (really_overloaded_fn (decl))
3568 decl = OVL_CURRENT (decl);
3571 TREE_USED (decl) = 1;
3572 if (DECL_CLONED_FUNCTION_P (decl))
3573 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3574 /* If we don't need a value, then we don't need to synthesize DECL. */
3575 if (skip_evaluation)
3577 /* Normally, we can wait until instantiation-time to synthesize
3578 DECL. However, if DECL is a static data member initialized with
3579 a constant, we need the value right now because a reference to
3580 such a data member is not value-dependent. */
3581 if (TREE_CODE (decl) == VAR_DECL
3582 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3583 && DECL_CLASS_SCOPE_P (decl))
3585 /* Don't try to instantiate members of dependent types. We
3586 cannot just use dependent_type_p here because this function
3587 may be called from fold_non_dependent_expr, and then we may
3588 see dependent types, even though processing_template_decl
3590 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3591 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3593 /* Pretend that we are not in a template, even if we are, so
3594 that the static data member initializer will be processed. */
3595 saved_processing_template_decl = processing_template_decl;
3596 processing_template_decl = 0;
3599 if (processing_template_decl)
3602 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3603 && !TREE_ASM_WRITTEN (decl))
3604 /* Remember it, so we can check it was defined. */
3606 if (DECL_DEFERRED_FN (decl))
3609 /* Remember the current location for a function we will end up
3610 synthesizing. Then we can inform the user where it was
3611 required in the case of error. */
3612 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3613 && !DECL_THUNK_P (decl))
3614 DECL_SOURCE_LOCATION (decl) = input_location;
3616 note_vague_linkage_fn (decl);
3619 assemble_external (decl);
3621 /* Is it a synthesized method that needs to be synthesized? */
3622 if (TREE_CODE (decl) == FUNCTION_DECL
3623 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3624 && DECL_ARTIFICIAL (decl)
3625 && !DECL_THUNK_P (decl)
3626 && ! DECL_INITIAL (decl)
3627 /* Kludge: don't synthesize for default args. Unfortunately this
3628 rules out initializers of namespace-scoped objects too, but
3629 it's sort-of ok if the implicit ctor or dtor decl keeps
3630 pointing to the class location. */
3631 && current_function_decl)
3633 synthesize_method (decl);
3634 /* If we've already synthesized the method we don't need to
3635 do the instantiation test below. */
3637 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3638 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3639 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3640 || (TREE_CODE (decl) == FUNCTION_DECL
3641 && DECL_INLINE (DECL_TEMPLATE_RESULT
3642 (template_for_substitution (decl))))
3643 /* We need to instantiate static data members so that there
3644 initializers are available in integral constant
3646 || (TREE_CODE (decl) == VAR_DECL
3647 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3648 /* If this is a function or variable that is an instance of some
3649 template, we now know that we will need to actually do the
3650 instantiation. We check that DECL is not an explicit
3651 instantiation because that is not checked in instantiate_decl.
3653 We put off instantiating functions in order to improve compile
3654 times. Maintaining a stack of active functions is expensive,
3655 and the inliner knows to instantiate any functions it might
3656 need. Therefore, we always try to defer instantiation. */
3657 instantiate_decl (decl, /*defer_ok=*/true,
3658 /*expl_inst_class_mem_p=*/false);
3660 processing_template_decl = saved_processing_template_decl;
3663 #include "gt-cp-decl2.h"